Man is an artifact designed for space travel. He is not designed to remain in his present biologic state any more than a tadpole is designed to remain a tadpole.
All travel has its advantages. If the passenger visits better countries he may learn to improve his own. And if fortune carries him to worse he may learn to enjoy it.
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Dealing with global warming doesn't mean we have all got to suddenly stop breathing. Dealing with global warming means that we have to stop waste and if you travel for no reason whatsoever that is a waste.
